<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="~assets/logo.png" alt="" draggable="false" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        class="login_form"
        :model="loginForm"
        :rules="loginRules"
        ref="loginFormRef"
      >
        <!-- 用户名  -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="iconfont icon-user"
            v-model="loginForm.username"
          >
          </el-input>
        </el-form-item>
        <!-- 密码  -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="iconfont icon-3702mima"
            v-model="loginForm.password"
            type="password"
          >
          </el-input>
        </el-form-item>
        <!-- 按钮区 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规则对象
      loginRules: {
        username: [
          // 验证用户名是否合法
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '长度在 3 到 10 个字符',
            trigger: 'blur'
          }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          {
            min: 6,
            max: 10,
            message: '长度在 6 到 10 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮 ，重置登录表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败!')
        this.$message.success('登录成功!')
        // 1.将登陆成功之后的token,保存到客户端的sessionStorage中
        // 1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
        // 1.2token只应在当前网站打开期间生效,所以将token保存在sessionStorage中
        sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转到后台主页,路由是地址/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.login_container {
  background: #2b4b6b;
  height: 100%;

  .login_box {
    width: 450px;
    height: 300px;
    background: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    box-sizing: border-box;
    padding: 0 20px;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }
}
</style>
